Cloth-cutting machine.



H. MAHVIIN. CLOTH CUTTING MACHINE.

APPLICATION HLED1uNE18.19x4.

1 170,652. e v Patented Feb. 8, 1916.

. y BV narran sirairns rarnnr cierren.

Erri-AN Meir/rin, or new Yonrr, N. Y.

CLOTH-CUTTING MA.GHINEL.4

Application filed June 13, 1914.

To all whom it may concern:

Be it known that l, HYMAN MAIMIN, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented certain new and useful mprovements in Cloth- Cutting Machines; and do hereby declare the following to be a full, clear, andeXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Because of the nature of the service required of cloth cutting machines having ro tary cutting blades, it is important not only to protect the rotating parts from the admission of dust thereto, but also to avoid all possibility of the catching up of lint or threads between the rotating blade and any exposed relatively stationary hub or support therefor. For this reason l have devised the herein disclosed novel structure of knifedriving gear, having a ball bearing carried thereby and substantially closed against the admission of dirt and dust, and a supporting stud and knife-clamping cap such that the stud is housed within the gear, while the knife is clamped to the gear, and the relatively stationary stud is at the same time inclosed, by the clamping cap which presents a smooth exterior surface rotating with the knife and having no tendency to catch lint or threads from the cloth.

ln the drawings Figure l is a side elevation and Fig. 2 is a cross-section of the standard of a cloth cutting machine to which my invention has been applied, and Figs. 3 and 4C are detail views of the knife-driving gear7 Fig. 3 being a face view and Fig. t a section of the gear on line 4 4 of Fig. 2.

' The standard 1 is recessed for the reception of a vertical driving shaft 2, carrying the bevel pinion 3 and the knife-driving gear 4L supported on the standard by the stud 5, and meshing with the pinion 3. The gear 4l Vconsists of a hub plate with a central openingand peripheral gear teeth as shown in Fig. 9., the wall of the central opening being screw threaded to receive the screw threaded hub of the clamping cap 6, which clamps the circular knife 7 against the gear l and at the saine time closes the central opening of the hub and incloses the end of the supporting stud 5, the result of this arrangement being that the knife, the gear and the cap rotate as a unit and no stationary sup- Speccation of Letters Patent.

Fatented Feb. 8, i916.

Serial` No. 845,822.

porting part is exposed at the face of the knife.

There is iixedly carried by the gear 4l a ball bearing comprising the inner and outer raceways 8 and 9, the interposed balls l0 and a spacing ring 1l carrying ball spacing elements l2 (F ig. 4) and substantially closing the ball space on the side facing the wall of the standard. These bearing parts are held in place in the annular recess formed in the gear by turning over the edge of the annular flange 13 as shown at lll in Fig. 2, and the depth of the hub plate from the central opening to the annular' flange 13 is such as to cover the outer raceway 9 and the space between the raceways, but not the inner raceway, as shown in Fig. 2. rlhis arrangement substantially closes the bearing against the admission of dust and dirt and at the same time permits the inner raceway 8 to 4be clamped against the standard and held stationary by the head of the stud 5.

The entire arrangement is one in which the parts are readily assembled, since it is only necessary to place the stud 5 through the central opening in the inner raceway 8 and screw the stud home until it clamps the raceway, then to place the annular knife against the gear el and screw home the clamping cap 6. When so assembled the bearing is well protected against the admission of dust and there are no exposed parts between which there is relative rotation.

Having thus described my invention, what I claim is:

l. ln a cloth cutting machine, a standard, a stud projecting therefrom, a knife, a knifedriving gear on the stud and a knife-clamping cap inclosing the end of the stud and cooperating with the gear to clamp the knife between them so that the knife, gear and cap rotate as a unit.

2. in a cloth cutting machine, a standard, a stud projecting therefrom, a knife-driving gear on the stud, and having an internally threaded hub, a circular knife having a central aperture, and a clamping cap having a screw-threaded hub passing through the central aperture of the knife into engagement with the screw threads of the gear so as to clamp the knife between the cap and gear for rotation as a unit.

3. In a cloth cutting machine, an upstanding recessed standard, a vertically disposed knife-driving shaft carrying a bevel gear in the recess of the standard, a, stud projecting gear for rotationas a unit, the standard, the laterally from the standard, a eoperative cap and the knife forming a closed housing bevel gear mounted for rotation on thev stud for the gearing. Y Y and having an internally threaded hub, a In te'etimony whereof I affix my signature, 5 circular cutting knife having a central in presence of two Witnesses.

aperture, a'nd a clamping ea'p having `a screw threaded hub extending through the M HYMAN MAIMIN' aperture of the knife into engagement With lVtnesses: the screw threads of the eoperative bevel BERNARD SACKS, 'i0 geai` to clamp the knife between the cap and MINNA STEINBERG.

Copies of this patent may be obtained for five` cents each; b`y addressing th`e` oinini'si'ei f Patents,

Washington'; D'. c. 

